Which of the following best describes a pair of elements that will form an ionic bond?

c and h: hydrogen easily loses electrons, and carbon gains them.

li and o: oxygen easily loses electrons, and lithium gains them.

p and cl: phosphorus easily loses electrons, and chlorine gains them.

ca and br: calcium easily loses electrons, and bromine gains them

Option (d) is the correct answer.

Explanation:

An ionic bond is formed between a metal and a non-metal as metals have more number of electrons and non-metals are electron deficient in nature.

So, in order to complete their octet metals lose electrons and non-metals gain them.

For example, calcium and bromine will form an ionic bond because being a metal calcium will lose electrons and bromine being a non-metal will gain electrons.

Thus, we can conclude that out of the given options, Ca and Br: Calcium easily loses electrons, and bromine gains them best describes a pair of elements that will form an ionic bond.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.